An ABC card or digital record can display the identifier connected with a student's Academic Bank of Credits account. That ID is used to associate eligible academic credits with the correct student record. It is different from a normal college roll number because its purpose is to connect eligible academic-credit records across the higher-education system. In this query, the focus is specifically on the eligibility age for abcid card, so the exact course or university details should be checked rather than applying a general rule.